Abstract
Summary A study was made of thylakoid membrane polar lipid composition and of chloroplast ultrastructure in triazine resistant (R) and susceptible (S) biotypes of four Amaranthus species. R biotypes showed higher values for MGDG/DGDG (monogalactosyl-diacylglycerides/digalactosyl-diacylglycerides) and MGDG/PL (monogalactosyl-diacylglycerides/phospholipids) ratios. For fatty acid composition, when R were compared with S biotypes, they showed higher trans-hexadecenoic acid content in the PL fraction, higher linolenic acid content in TL, MGDG and DGDG, and lower linoleic acid content in TL, MGDG and DGDG. Studies of chloroplast ultrastructure revealed no appreciable difference between RandS biotypes with regard to the chlorophyll a/b ratio or the extent of thylakoid appression.
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